My reading of the Bachmann press release indicated that the system could work on either DC or DCC layouts independent of existing systems.
On a DC layout the power would have to be provided at near full voltage giving (I guess) the ability to run alone on a block but independently controlled.
It does seem to be an option for someone to bring a locomotive to a club layout and be certain that it could run independent of the systems they use.
The system is in its early days and is dependent on mobile phone technology remaining constant in at least one regard for the expected life of the system.
Bachmann have only released one locomotive so far, their basic range FT, which is a very early diesel locomotive from 1939. This means that it could run with the great majority of steam models available, predating the Pennsylvania T-1 4-4-4-4, for example.
The FT isn't up to current standards of detail, although the livery of the latest versions seems to be better than some early production models.
Bachmann have made a point of including DCC and sound in relatively reasonably priced models.
It will be interesting to see if this idea succeeds.